/* $NetBSD: kerberos.c,v 1.1.1.6.6.1 2019/08/10 06:17:10 martin Exp $ */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 1998-2019 The OpenLDAP Foundation. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted only as authorized by the OpenLDAP * Public License. * * A copy of this license is available in the file LICENSE in the * top-level directory of the distribution or, alternatively, at * . */ #include #include #include /* BER_BVC definition */ #include "lutil.h" #include #ifdef HAVE_KRB5 #include #elif defined(HAVE_KRB4) #include #endif /* From */ LDAP_F( char *) ldap_pvt_get_fqdn LDAP_P(( char * )); static LUTIL_PASSWD_CHK_FUNC chk_kerberos; static const struct berval scheme = BER_BVC("{KERBEROS}"); static int chk_kerberos( const struct berval *sc, const struct berval * passwd, const struct berval * cred, const char **text ) { unsigned int i; int rtn; for( i=0; ibv_len; i++) { if(cred->bv_val[i] == '\0') { return LUTIL_PASSWD_ERR; /* NUL character in password */ } } if( cred->bv_val[i] != '\0' ) { return LUTIL_PASSWD_ERR; /* cred must behave like a string */ } for( i=0; ibv_len; i++) { if(passwd->bv_val[i] == '\0') { return LUTIL_PASSWD_ERR; /* NUL character in password */ } } if( passwd->bv_val[i] != '\0' ) { return LUTIL_PASSWD_ERR; /* passwd must behave like a string */ } rtn = LUTIL_PASSWD_ERR; #ifdef HAVE_KRB5 /* HAVE_HEIMDAL_KRB5 */ { /* Portions: * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska H\xf6gskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ krb5_context context; krb5_error_code ret; krb5_creds creds; krb5_get_init_creds_opt get_options; krb5_verify_init_creds_opt verify_options; krb5_principal client, server; #ifdef notdef krb5_preauthtype pre_auth_types[] = {KRB5_PADATA_ENC_TIMESTAMP}; #endif ret = krb5_init_context( &context ); if (ret) { return LUTIL_PASSWD_ERR; } #ifdef notdef krb5_get_init_creds_opt_set_preauth_list(&get_options, pre_auth_types, 1); #endif krb5_get_init_creds_opt_init( &get_options ); krb5_verify_init_creds_opt_init( &verify_options ); ret = krb5_parse_name( context, passwd->bv_val, &client ); if (ret) { krb5_free_context( context ); return LUTIL_PASSWD_ERR; } ret = krb5_get_init_creds_password( context, &creds, client, cred->bv_val, NULL, NULL, 0, NULL, &get_options ); if (ret) { krb5_free_principal( context, client ); krb5_free_context( context ); return LUTIL_PASSWD_ERR; } { char *host = ldap_pvt_get_fqdn( NULL ); if( host == NULL ) { krb5_free_principal( context, client ); krb5_free_context( context ); return LUTIL_PASSWD_ERR; } ret = krb5_sname_to_principal( context, host, "ldap", KRB5_NT_SRV_HST, &server ); ber_memfree( host ); } if (ret) { krb5_free_principal( context, client ); krb5_free_context( context ); return LUTIL_PASSWD_ERR; } ret = krb5_verify_init_creds( context, &creds, server, NULL, NULL, &verify_options ); krb5_free_principal( context, client ); krb5_free_principal( context, server ); krb5_free_cred_contents( context, &creds ); krb5_free_context( context ); rtn = ret ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK; } #elif defined(HAVE_KRB4) { /* Borrowed from Heimdal kpopper */ /* Portions: * Copyright (c) 1989 Regents of the University of California. * All rights reserved. The Berkeley software License Agreement * specifies the terms and conditions for redistribution. */ int status; char lrealm[REALM_SZ]; char tkt[MAXHOSTNAMELEN]; status = krb_get_lrealm(lrealm,1); if (status == KFAILURE) { return LUTIL_PASSWD_ERR; } snprintf(tkt, sizeof(tkt), "%s_slapd.%u", TKT_ROOT, (unsigned)getpid()); krb_set_tkt_string (tkt); status = krb_verify_user( passwd->bv_val, "", lrealm, cred->bv_val, 1, "ldap"); dest_tkt(); /* no point in keeping the tickets */ return status == KFAILURE ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK; } #endif return rtn; } int init_module(int argc, char *argv[]) { return lutil_passwd_add( (struct berval *)&scheme, chk_kerberos, NULL ); }